<template>
	<div>
		<el-breadcrumb separator-class="el-icon-arrow-right">
			<el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
			<el-breadcrumb-item>商品管理</el-breadcrumb-item>
			<el-breadcrumb-item>参数列表</el-breadcrumb-item>
		</el-breadcrumb>

		<!-- 卡片区域 -->
		<el-card class="box-card">
			<!-- 警告框 -->
			<el-alert title="注意:只允许为第三级分类设置相关参数!" type="warning" :closable="false" show-icon></el-alert>

			<!-- 选择商品分类区域 -->
			<el-row class="cat_opt">
				<el-col>
					<span>选择商品分类：</span>
					<!-- 选择商品分类的级联选择框 -->
					<el-cascader
						v-model="selectedCateKeys"
						:options="paramsList"
						:props="{ expandTrigger: 'hover', value: 'cat_id', label: 'cat_name', children: 'children' }"
						@change="handleChange"
					></el-cascader>
				</el-col>
			</el-row>

			<!-- tabs 商品标签页区域 -->
			<el-tabs v-model="activeName" @tab-click="handleTabsClick">
				<!-- 添加参数的面板 -->
				<el-tab-pane label="动态参数" name="many">
					<!-- 添加参数的按钮 -->
					<el-button type="primary" size="mini" :disabled="isBtnDisable" @click="paramsDialogVisible = true">添加参数</el-button>
					<el-table :data="manyTableData" border stripe>
						<!-- 展开行 -->
						<el-table-column type="expand">
							<!-- 循环渲染参数下的tag标签 -->
							<template slot-scope="scope">
								<el-tag v-for="(item, index) in scope.row.attr_vals" :key="index" closable @close="handleClose(i,scope.row)">{{ item }}</el-tag>
								<!-- 输入文本框 -->
								<el-input
									class="input-new-tag"
									v-if="scope.row.inputVisible"
									v-model="scope.row.inputValue"
									size="small"
									@keyup.enter.native="handleInputConfirm(scope.row)"
									@blur="handleInputConfirm(scope.row)"
								></el-input>
								<!-- 添加按钮 -->
								<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
							</template>
						</el-table-column>
						<!-- 索引列 -->
						<el-table-column type="index"></el-table-column>
						<el-table-column label="参数名称" prop="attr_name"></el-table-column>
						<el-table-column label="操作">
							<template slot-scope="scope">
								<el-button size="mini" type="primary" icon="el-icon-edit" @click="showDialogVisible(scope.row.attr_id)">编辑</el-button>
								<el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
							</template>
						</el-table-column>
					</el-table>
				</el-tab-pane>
				<!-- 添加属性的面板 -->
				<el-tab-pane label="静态属性" name="only">
					<!-- 添加属性的按钮 -->
					<el-button type="primary" size="mini" :disabled="isBtnDisable" @click="paramsDialogVisible = true">添加属性</el-button>
					<el-table :data="onlyTableData" border stripe>
						<!-- 静态属性表格 -->
						<!-- 展开行 -->
						<el-table-column type="expand">
							<!-- 循环渲染参数下的tag标签 -->
							<template slot-scope="scope">
								<el-tag v-for="(item, index) in scope.row.attr_vals" :key="index" closable @close="handleClose(i,scope.row)">{{ item }}</el-tag>
								<!-- 输入文本框 -->
								<el-input
									class="input-new-tag"
									v-if="scope.row.inputVisible"
									v-model="scope.row.inputValue"
									size="small"
									@keyup.enter.native="handleInputConfirm(scope.row)"
									@blur="handleInputConfirm(scope.row)"
								></el-input>
								<!-- 添加按钮 -->
								<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
							</template>
						</el-table-column>
						<!-- 索引列 -->
						<el-table-column type="index"></el-table-column>
						<el-table-column label="参数名称" prop="attr_name"></el-table-column>
						<el-table-column label="操作">
							<template slot-scope="scope">
								<el-button size="mini" type="primary" icon="el-icon-edit" @click="showDialogVisible(scope.row.attr_id)">编辑</el-button>
								<el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
							</template>
						</el-table-column>
					</el-table>
				</el-tab-pane>
			</el-tabs>
		</el-card>

		<!-- 添加参数和属性对话框 -->
		<el-dialog :title="'添加' + titleText" :visible.sync="paramsDialogVisible" width="50%" @close="addDialogClose">
			<el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
				<el-form-item label="活动名称" prop="attr_name"><el-input v-model="addForm.attr_name"></el-input></el-form-item>
			</el-form>
			<span slot="footer" class="dialog-footer">
				<el-button @click="paramsDialogVisible = false">取 消</el-button>
				<el-button type="primary" @click="addParams">确 定</el-button>
			</span>
		</el-dialog>

		<!-- 修改参数和属性对话框 -->
		<el-dialog :title="'添加' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClose">
			<el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
				<el-form-item label="活动名称" prop="attr_name"><el-input v-model="editForm.attr_name"></el-input></el-form-item>
			</el-form>
			<span slot="footer" class="dialog-footer">
				<el-button @click="editDialogVisible = false">取 消</el-button>
				<el-button type="primary" @click="editParams">确 定</el-button>
			</span>
		</el-dialog>
	</div>
</template>

<script>
export default {
	name: 'Params',
	data() {
		return {
			//商品分类列表
			paramsList: [],
			//级联选择框双向绑定到的数组
			selectedCateKeys: [],
			//设置tabs 标签页显示的是谁
			activeName: 'many',
			//动态参数的数据
			manyTableData: [],
			//静态属性的数据
			onlyTableData: [],
			paramsDialogVisible: false,
			addForm: {
				attr_name: ''
			},
			addFormRules: {
				attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }, { min: 2, max: 10, message: '长度在 2 到 10 个字符', trigger: 'blur' }]
			},
			//控制修改对话框的显示
			editDialogVisible: false,
			//保存修改对话框的数据
			editForm: {},
			//设置修改对话的规则
			editFormRules: {
				attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }, { min: 2, max: 10, message: '长度在 2 到 10 个字符', trigger: 'blur' }]
			}
		};
	},
	created() {
		this.getParamsList();
	},
	methods: {
		async getParamsList() {
			const { data: res } = await this.$http.get('categories');
			this.paramsList = res.data;
			console.log(this.paramsList);
		},
		//级联选择框选中这个项变化，会触发这个函数
		handleChange() {
			// console.log(this.selectedCateKeys)
			this.getParamsData();
		},
		// tabs 页签点击事件的处理函数
		handleTabsClick() {
			console.log(this.activeName);
			this.getParamsData();
		},
		//获取参数的列表数据
		async getParamsData() {
			//证明选中的不是三级分类
			if (this.selectedCateKeys.length !== 3) {
				this.selectedCateKeys = [];
				this.manyTableData = [];
				this.onlyTableData = []
				return;
			}
			//证明选中的是三级分类
			console.log(this.selectedCateKeys);
			//根据所选分类的id，和当前所处的面板，获取对应的参数
			const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
				params: {
					sel: this.activeName
				}
			});

			if (res.meta.status !== 200) {
				return this.$message.error('获取参数列表失败');
			}
			//获取参数下的可选项设置
			res.data.forEach(item => {
				//判断attr_vals 是否为空，如果为空，则返回一个空的数组
				item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : [];
				//设置添加文本框的显示与隐藏
				item.inputVisible = false;

				//保存获取到的文本框数值
				item.inputValue = '';
			});
			console.log(res.data);

			if (this.activeName === 'many') {
				this.manyTableData = res.data;
			} else {
				this.onlyTableData = res.data;
			}
		},
		//监听添加对话框的关闭事件
		addDialogClose() {
			this.$refs.addFormRef.resetFields();
		},
		//点击	确定，完成数据录入
		addParams() {
			this.$refs.addFormRef.validate(async valid => {
				if (!valid) return;
				const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
					attr_name: this.addForm.attr_name,
					attr_sel: this.activeName
				});
				if (res.meta.status !== 201) return this.$message.error('保存数据失败');
				this.$message.success('保存数据成功');
				this.getParamsData();
				this.paramsDialogVisible = false;
			});
		},
		//点击按钮，修改参数和属性
		editParams() {
			this.$refs.editFormRef.validate(async valid => {
				if (!valid) return;
				const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
					attr_name: this.editForm.attr_name,
					attr_sel: this.activeName
				});

				if (res.meta.status !== 200) return this.$message.error('修改数据失败');
				this.$message.success('修改数据成功');
				this.getParamsData();
				this.editDialogVisible = false;
			});
		},
		//监听关闭修改对话框
		editDialogClose() {
			this.$refs.editFormRef.resetFields();
		},
		//点击按钮，展开修改的对话框
		async showDialogVisible(attrId) {
			// console.log(attrId)
			const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`);
			if (res.meta.status !== 200) return this.$message.error('获取参数失败');
			this.editForm = res.data;
			this.editDialogVisible = true;
		},
		//删除对应的参数项
		async removeParams(attr_id) {
			const confirmResult = await this.$confirm('此操作将永久删除该用户, 是否继续?', '提示', {
				confirmButtonText: '确定',
				cancelButtonText: '取消',
				type: 'warning'
			}).catch(err => err);

			//如果用户确认删除，则返回值为字符串 confirm
			//如果用户取消了删除，则返回值为字符串 cancel
			// console.log(confirmResult)
			if (confirmResult !== 'confirm') {
				return this.$message.info('已取消删除！');
			}
			//删除业务逻辑，调用接口
			const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`);
			if (res.meta.status !== 200) return this.$message.error('修改数据失败');
			this.$message.success('修改数据成功');
			this.getParamsData();
		},
		//文本框失去焦点，或者按钮Enter键触发
		async handleInputConfirm(row) {
			if(row.inputValue.trim().length === 0){
				row.inputValue = ''
				row.inputVisible = false
				return
			}
			
			//如果没有return，则证明输入的内容，需要做后续处理
			row.attr_vals.push(row.inputValue.trim())
			//需要发起请求，保存这次操作
			this.saveAttrVals(row)
		
		},
		// 定义一类公共的方法，调用服务器请求
		async saveAttrVals(row){
			//需要发起请求，保存这次操作
			const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
				attr_name:row.attr_name,
				attr_sel:row.attr_sel,
				attr_vals:row.attr_vals.join(' ')
			})
			if(res.meta.status !== 200){
				this.$message.error("添加参数失败，请重试")
			}
			this.$message.success("添加参数成功")
			row.inputValue = ''
			row.inputVisible = false
		},
		//点击按钮进行文本框的显示
		showInput(row) {
			row.inputVisible = true;
			//让文本框自动获得焦点、
			//$nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
			this.$nextTick(_ => {
				this.$refs.saveTagInput.$refs.input.focus();
			});
		},
		//删除对应参数可选项
		handleClose(i,row){
			row.attr_vals.splice(i,1)
			this.saveAttrVals(row)
		}
	},
	computed: {
		//如果按钮需要被禁用，则返回true，否则返回false
		isBtnDisable() {
			if (this.selectedCateKeys.length !== 3) {
				return true;
			}
			return false;
		},
		//当前选中的三级分类的id
		cateId() {
			if (this.selectedCateKeys.length === 3) {
				return this.selectedCateKeys[2];
			}
			return null;
		},
		//动态计算标题的文本
		titleText() {
			if (this.activeName === 'many') {
				return '动态参数';
			}
			return '静态属性';
		}
	}
};
</script>

<style lang="less" scoped="scoped">
.cat_opt {
	margin-top: 20px;
}
.el-tag{
	margin: 10px;
}
.input-new-tag {
	width: 120px;
}
</style>
